Weighted Least Squares
Mostrando 13-24 de 48 artigos, teses e dissertações.
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13. Estimador de estado inteligente para análise de perdas em sistemas de distribuição de energia. / Intelligent state estimator system for distribution systems.
O presente trabalho tem por objetivo propor uma metodologia de estimação de estado (EE) para sistemas de distribuição de energia que auxilie na identificação das regiões de fornecimento das concessionárias de distribuição que possam conter perdas não técnicas, de modo a orientar as ações para sua redução. As perdas não técnicas de energia e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2011
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14. Curves of growth and productivity of Nellore and cross from different biological types in intensive production system / Curvas de crescimento e produtividade de vacas Nelore e cruzadas, de diferentes tipos biológicos, em sistema de produção intensiva
Initially, were analyzed weight-age data from birth to 100 months of age from cows of four genetic groups (G): Nellore (NEL), ½Nellore + ½Canchim (CN), ½Angus +½Nellore (AN) and ½Simmental + ½Nellore (SN), of a experiment carried out at Embrapa Southeast Cattle Research Center, State of São Paulo, Brazil. The animals considered in this study were born
Publicado em: 2010
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15. Treadmill exercise testing of asymptomatic men and women without evidence of heart disease
The aim of this study was to test the hypothesis of differences in performance including differences in ST-T wave changes between healthy men and women submitted to an exercise stress test. Two hundred (45.4%) men and 241 (54.6%) women (mean age: 38.7 ± 11.0 years) were submitted to an exercise stress test. Physiologic and electrocardiographic variables wer
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-12
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16. Estimation of parameters of signals generated by time invariant linear systems / Estimação de parâmetros de sinais gerados por sistemas lineares invariantes no tempo
A study on the recovery of signals modeled by weighted sums of complex exponentials complex is presented. For this, basic concepts of signals and systems theory are introduced. In particular, the linear time invariant systems (LTI Systems) are considered, which can be mathematically represented by differential equations or difference equations, respectively,
Publicado em: 2009
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17. State estimator based on the least median method / Estimador de estado robusto baseado no método da mínima mediana
Nas últimas décadas, diversos estimadores de estado foram desenvolvidos e aplicados em sistemas elétricos de potência (SEP), dos quais se destaca o baseado no método da mínima mediana. Isso em razão desse, conhecido como estimador por mínima mediana do resíduo ponderado ao quadrado (do inglês, Weighted Least Median of Squares - WLMS), ser capaz de
Publicado em: 2009
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18. Fatores de escolha pelo curso de Ciências Contábeis : uma pesquisa com os graduandos na capital e Grande São Paulo
Neste estudo, testou-se um modelo teórico através da Modelagem de Equações Estruturais (SEM), que demonstrasse os motivos que influenciam o aluno pela escolha do curso de Ciências Contábeis. Uma escala de Likert com 32 indicadores ou variáveis, baseada em três constructos: econômico, psicológico e social, foi aplicada através de um questionário e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2008
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19. Controle genÃtico da resistÃncia à Meloidogyne incognita nas cultivares de alface Grand Rapids e Salinas 88 / Resistance of the lettuce cultivar Salinas 88 to Meloidogyne incognita (Kofoid &White) Chitwood.
In spite of the advances in plant breeding, horticulture still faces problems such as the incidence of root-knot nematodes (Meloidogyne spp.), which are difficult to control. Varietal resistance is the most efficient and economical form of controling the pathogen. Few studies have been effected on nematode resistance in lettuce and its genetic control. These
Publicado em: 2006
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20. Modelling Complex Longitudinal Survey Data
Modelling methods for longitudinal complex survey data are investigated in this thesis. An empirical investigation using longitudinal survey data is conducted. Variance effects of clustering are identified and results indicate that clustering impacts may be stronger for longitudinal studies than for cross-sectional studies. Earlier empirical evidence that th
Publicado em: 2005
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21. Impact evaluation of bolsa escola programs on child labor in Brazil. / Avaliação do impacto dos programas de bolsa escola no trabalho infantil no Brasil.
There is a consensus in the literature that if a child works his/her level of schooling will decrease and consequently he/she will receive lower wages in adult life, forcing their children to work to guarantee family subsistence. Based on the hypothesis that children work to complement family income, the initiatives to eradicate child labor helps to diminish
Publicado em: 2004
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22. RADIOLOCALIZAÇÃO DE TERMINAIS DE COMUNICAÇÕES MÓVEIS / RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line
Publicado em: 2004
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23. Estudos espectroscopicos em atomos e moleculas : calculos de forças de osciladores e tempos de vida para ions de Si, medidas de momento de recuo de ions em atomos de Cs resfriados a laser e medidas de multicoincidência em moleculas de N2 e O2
This thesis comprises atomic and molecular physics studies, both theoretical and experimental. Weighted oscillator strengths and lifetimes were calculated for the following silicon ions: Si I, Si XI, Si XII and Si XIII. The calculations were carried out in a multiconfiguration Hartree-Fock relativistic aproach. The eletrostatic parameters were optimized by a
Publicado em: 2003
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24. Weighted oscillator strengths and lifetimes for the neutral oxygen spectrum, O I
The weighted oscillator strengths (gf) and the lifetimes for O I presented in this work were obtained in a multiconfiguration Hartree-Fock relativistic (HFR) approach. In this calculation, the electro-static parameters were optimized by a least-squares procedure, in order to improve the adjustment to experimental energy levels. This method produces gf-values
Brazilian Journal of Physics. Publicado em: 2001-03